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  1. #31

    Join Date
    Nov 2004
    Posts
    1,174
    A 1-shot carbonate version takes a long time to make but the Quercetin capsules,stored in their container , last indefinitely.
    Suitable for occasional use of staining developer.

    QS-1
    Metol .............................0.1g
    Quercetin........................0.5g
    Sodium Carbonate anh......2.5g
    Water to........................500ml

    Weigh out solids into container, add 500ml just boiled hot water, stir, filter through cotton wool (the Quercetin does not all dissolve)
    Develop 30min 20C.
    Attached Thumbnails Attached Thumbnails QS-1-1.jpg  

  2. #32

    Join Date
    Nov 2004
    Posts
    1,174
    Quercetin alone without metol provides developers like weak caffenol.

    Qu-2
    Water(room temp)...........................500 ml
    Washing soda,Arm & Hammer (US).....4.5 tsp
    or washing soda decahydrate (UK).......10 tsp
    Iodized salt......................................0.5 tsp
    Quercetin, 2 capsules contents,..........1.0 g

    Stir 15 min,filter through cotton wool.
    I semi-stand developed APX 100 in this 2hrs 70F, agitate every 30 min.
    The negatives are much fogged but strongly stained and tanned.

    Qu-3
    As Qu-2 with addition of 1 tsp vitamin C.
    I developed APX 100 in this 30 min 68F, agitate 10s/minute.
    The negatives are somewhat fogged but produce sharp ,fairly fine grained prints.
    There is only weak tanning, probably not enough to control highlight density.

    Likely the reason why addition of vitamin C speeds up the development is that in Qu-3 it removes the oxidation products found with Qu-2 that tan the gelatin.

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